Fructose Causes Liver Damage

The role of dietary fructose in the development of obesity and fatty liver diseases remains controversial, with previous studies indicating that the problems resulted from fructose and a diet too high in calories.

However, a new study conducted in an animal model at Wake Forest Baptist Medical Center showed that fructose rapidly caused liver damage even without weight gain. The researchers found that over the six-week study period liver damage more than doubled in the animals fed a high-fructose diet as compared to those in the control group.

The study is published in the June 19 online edition of the American Journal of Clinical Nutrition.
"Is a calorie a calorie? Are they all created equal? Based on this study, we would say not," said Kylie Kavanagh, D.V.M., assistant professor of pathology-comparative medicine at Wake Forest Baptist and lead author of the study.

In a previous trial which is referenced in the current journal article, Kavanagh's team studied monkeys who were allowed to eat as much as they wanted of low-fat food with added fructose for seven years, as compared to a control group fed a low-fructose, low-fat diet for the same time period. Not surprisingly, the animals allowed to eat as much as they wanted of the high-fructose diet gained 50 percent more weight than the control group. They developed diabetes at three times the rate of the control group and also developed hepatic steatosis, or non-alcoholic fatty liver disease.

The big question for the researchers was what caused the liver damage. Was it because the animals got fat from eating too much, or was it something else?

To answer that question, this study was designed to prevent weight gain. Ten middle-aged, normal weight monkeys who had never eaten fructose were divided into two groups based on comparable body shapes and waist circumference. Over six weeks, one group was fed a calorie-controlled diet consisting of 24 percent fructose, while the control group was fed a calorie-controlled diet with only a negligible amount of fructose, approximately 0.5 percent.

Both diets had the same amount of fat, carbohydrate and protein, but the sources were different, Kavanagh said. The high-fructose group's diet was made from flour, butter, pork fat, eggs and fructose (the main ingredient in corn syrup), similar to what many people eat, while the control group's diet was made from healthy complex carbohydrates and soy protein.

Every week the research team weighed both groups and measured their waist circumference, then adjusted the amount of food provided to prevent weight gain. At the end of the study, the researchers measured biomarkers of liver damage through blood samples and examined what type of bacteria was in the intestine through fecal samples and intestinal biopsies.

"What surprised us the most was how quickly the liver was affected and how extensive the damage was, especially without weight gain as a factor," Kavanagh said. "Six weeks in monkeys is roughly equivalent to three months in humans."

In the high-fructose group, the researchers found that the type of intestinal bacteria hadn't changed, but that they were migrating to the liver more rapidly and causing damage there. It appears that something about the high fructose levels was causing the intestines to be less protective than normal, and consequently allowing the bacteria to leak out at a 30 percent higher rate, Kavanagh said.

One of the limitations of the study was that it only tested for fructose and not dextrose. Fructose and dextrose are simple sugars found naturally in plants.

"We studied fructose because it is the most commonly added sugar in the American diet, but based on our study findings, we can't say conclusively that fructose caused the liver damage," Kavanagh said. "What we can say is that high added sugars caused bacteria to exit the intestines, go into the blood stream and damage the liver.

"The liver damage began even in the absence of weight gain. This could have clinical implications because most doctors and scientists have thought that it was the fat in and around tissues in the body that caused the health problems."

The Wake Forest Baptist team plans to begin a new study using the same controls but testing for both fructose and dextrose over a longer time frame.
The study was supported by Wake Forest School of Medicine and grants RR019963, OD010965 and AG033641 from the National Institutes of Health.

Co-authors are Ashley Wylie and Kelly Tucker, B.S., of Wake Forest Baptist; John Culler, D.V.M., Ph.D., of North Carolina State University; Timothy Hamp, B.S., Anthony Fodor, Ph.D., and Raad Gharaibeh, Ph.D., of the University of North Carolina at Charlotte.

Story Source:
The above story is reprinted from materials provided by Wake Forest Baptist Medical Center.
Note: Materials may be edited for content and length. For further information, please contact the source cited above.

This isn't a very good study. Since the sources of protein and fat were different as well, all they really can conclude is one diet caused liver damage while the other didn't. Heck, you could just as easily title this article as "Pork Causes Liver Damage" or "Butter Causes Liver Damage".

If you are going to assess the effects of fructose in a diet, change ONLY fructose between the diets. They even admit this by saying they are doing another study which assesses dextrose vs fructose...which is the study they should have done to start with. I'm surprised this got published.

Both diets had the same amount of fat, carbohydrate and protein, but the sources were different, Kavanagh said. The high-fructose group's diet was made from flour, butter, pork fat, eggs and fructose (the main ingredient in corn syrup), similar to what many people eat, while the control group's diet was made from healthy complex carbohydrates and soy protein.

This is dumb. All they need to do was replace the fructose in the first diet with dextrose.

Are these researchers really that ignorant or just trying to misrepresent. Not sure which is worse.

I actually think is a good 1st step in understanding the health risks of fructose enriched, corn based products. There is a major obesity and health crisis currently that needs to be understood, and when most of the 'affordable foods' contain high levels of these ingredients we should be studying their affects. Folks on this board are generally well educated about nutrition and informed about what they put into their body. That's much less true for the average Joe. My $.02...